fix: disable Loki gateway and use direct service endpoints

ansible/roles/observability/templates/grafana-datasource-loki.yaml.j2

@@ -12,5 +12,5 @@ data:
       - name: Loki
         type: loki
         access: proxy
-        url: http://loki-gateway.{{ observability_namespace }}.svc.cluster.local
+        url: http://loki.{{ observability_namespace }}.svc.cluster.local:3100
         isDefault: false

ansible/roles/observability/templates/loki-values.yaml.j2

@@ -27,6 +27,9 @@ read:
 write:
   replicas: 0
 
+gateway:
+  enabled: false
+
 singleBinary:
   replicas: 1
   resources:

ansible/roles/observability/templates/promtail-values.yaml.j2

@@ -1,3 +1,3 @@
 config:
   clients:
-    - url: http://loki-gateway.{{ observability_namespace }}.svc.cluster.local/loki/api/v1/push
+    - url: http://loki.{{ observability_namespace }}.svc.cluster.local:3100/loki/api/v1/push